ColorJitter

ColorJitter can be used to adjust the contrast and brightness of an input image.

using Augmentor
using ImageShow, ImageCore

img_in = testpattern(RGB, ratio=0.5)

mosaicview(
    img_in,
    augment(img_in, ColorJitter(1.2, 0.3)),
    augment(img_in, ColorJitter(0.75, -0.2));
    fillvalue=colorant"white", nrow=1, npad=10
)

References

Augmentor.ColorJitter — Type

ColorJitter <: ColorOperation

Description

Adjusts the brightness and contrast of an image according to the formula α * image[i] + β * M, where M is either mean(image) or the maximum intensity value.

Usage

ColorJitter()
ColorJitter(α, β; [usemax])

Arguments

α : Real or AbstractVector of Real that denote the coefficient(s) for contrast adjustment. Defaults to 0.8:0.1:1.2.
β : Real or AbstractVector of Real that denote the coefficient(s) for brightness adjustment. Defaults to -0.2:0.1:0.2.
usemax::Bool: Optional. If true, the brightness will be adjusted by the maximum intensity value; otherwise, the image mean will be used. Defaults to true.

Examples

using Augmentor
img = testpattern()

# use exactly 1.2 for contrast, and one of 0.5 and 0.8 for brightness
augment(img, ColorJitter(1.2, [0.5, 0.8]))

# pick the coefficients randomly from the specified ranges
augment(img, ColorJitter(0.8:0.1:2.0, 0.5:0.1:1.1))

source

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